Investigators also found a silver iPhone in a purple case that may have been left behind by one of the shooters.

The shooting happened shortly before 6 p.m. on Mother's Day in the Sunningdale Commons subdivision, near The Country Club of Indianapolis.

The home was unoccupied at the time, but multiple neighbors who were home said that eight people arrived in three cars before opening fire, according to IMPD police reports. A rear door to the home was also kicked in, and shots were fired inside.

Parks Frazier, the Colts assistant coach, throws footballs to players before the start of their game against the Oakland Raiders at Oakland Alameda Coliseum in Oakland, CA., Sunday, Oct 28, 2018.(Photo: Matt Kryger/IndyStar)

A resident of the neighborhood told IndyStar she noticed “random and suspicious cars” parked on the street in the days leading up to the shooting.

The resident has lived in the neighborhood, which is home to retirees and young families, since the 1990s and was having dinner with family when she heard the gunshots she thought were firecrackers.

“Then when it stopped I realized they were gunshots, and we saw two cars speeding away,” she said. “I built my home here and nothing like this had ever happened before. Everyone here knows everyone.”

On Wednesday, police said the case was still under investigation. Investigators have not commented on a possible motive or identified any suspects.

The Indianapolis Colts have released the following statement in response to the shooting:

"We are extremely thankful our employee was not home at the time of the incident. Because this is an ongoing investigation, we have no further comment."

According to the police report, a few neighbors' homes were also hit during the shooting. Police recovered shell casings and bullet fragments on Sunday, and went back on Monday to recover more.